Boiler attachment



(No Model.) 2 SheetsSheet 1.

W. I. MILLER.

BOILER ATTAGHMENT.

No. 595,190. Patented De0.7,189'7.

IIVVE/VTUR WL'ZZL'am/ I. JIZZZZen By W A "OR/V578.

2 Sheets-Sheet 2.

(No Model.)

W. I. MILLER.

BOILER ATTACHMENT.

Pa tented De0.7,1897.

WITNESSES ATTORNEYS.

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Unirnn STATES PATENT Quince.

WILLIAM I. MILLER, OF ATOHISON, KANSAS.

BOILER ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 595,190, dated December 7, 1897.

Application filed July 20, 1897.

To whom it 122mg concern:

Be it known that I, 1V ILLIAM I. MILLER, of Atchison, in the county of Atchison and State of Kansas, have invented a new and useful Improvement in Boiler Attachments, of which the following is a specification.

My invention consists in certain valve attachments for the feed-pipe of aboiler, more especially a locomotive-boiler, for the purpose of allowing a circulation of hot water through said pipe to prevent freezing in cold weather when the feed-pump or injector is not working.

In the accompanying drawings, Figure 1 is a diagrammatic view of an engine with my improvement applied Fig. 2 is a detail view, parts being broken away and others shown in section. Fig. 3 is an enlarged sectional View of the valve that connects with the boiler, and Fig. 1 is a similar view of the valve that connects with the injector.

The boiler feed-pipe A is arranged in the usual way for connecting the boiler B with the tank C in the locomotive-tender, and it is provided with an automatic check-valve D at its upper end where attached to the boiler and with another similar valve E at its lower end, where it connects with the pump or injector F. The first-mentioned valve D is known as the main or boiler check, and the other or lower one E is known as the intermediate valve. The boiler check-valve proper, 1, Fig. 2, seats upon and slides vertically in a tubular extension 2 of the casing 23 and has due play between such seat 2 and the screw-plug 4, which provides for access to the valve 1 or its removal from the casing 23, when required.

The intermediate check-valve proper, 5, is arranged in substantiallythe same manner as the main valve 1, itbeing seated upon and guided by the tubular portion 6 of the web or diaphragm, which is cast integrally with the casing 7 in the usual manner.

Each of the valves D E is provided with a small passage that allows a leak of hot water around and past the valves, so that a slow circulation may be maintained through the feed-pipe A when the feed or injector F is not in operation. The leak of the interme- Serial No. 6%,210. (No model.)

di'ate valve is always open and the other is subject to control, as will be now explained.

A gland S is screwed into an opening formed in the lower side of the main valve-casing 3, and a tubular threaded valve stem or rod 9 works in said gland and is provided exteriorly with a small hand-wheel, as shown. The inner end of the stem 9 is rounded or hemispherical to adapt it to serve as a valve for closing the passage 10, bored diagonally through the base of the tubular extension 2, constitutingthe guide and seat for the valve proper, 1, as before stated. The said passage 10 is alined with the bore in the gland 8, and it is obvious this arrangement permits the former to be easily drilled through the opening into which the gland screws.

The tubular seat and guide 6 for the intermediate check-valve 5 has a small transverse or horizontal opening 11 at a point just below the valve, and the same is threaded to receive a short tapered tube 12, that projects laterally, as shown.

It is apparent the leak or passage through this tube 12 is always open, so that water may constantly circulate around and past the valve 5. It is further apparent that by n1anipulating the stem-valve 9 the inclined passage 10 in the tubular seat and guide 2 of the main check-valve 1 may be opened, and thus a leak will be provided whereby water will pass around said valve 1. In brief, by opening the stem-valve 9, as shown by dotted lines, Fig. 3, hot water from the boiler B will circulate through the feed-pipe A to the tank 0 when the injector F is not working, and this circulation is sufficient to prevent freezing of the water in said feed-pipe even in the coldest weather.

When the stem-valve 9 is closed for a considerable period, say several months, in the warmer portion of the year, the opening or passage 10 will ordinarily become filled with scale or sediment, which becomes so hardened by the high heat as to require to be drilled out in order to permit due circulation of water. To obviate the necessity for this,

I have provided the valve 9 with a reduced longitudinal extension 13 in the nature of a cylindrical prong, which is just long enough to pass through the said opening when the valve 1 is closed, as shown by full lines in Fig. 3. Said prong 13 prevents deposit of scale to any great extent, and since it may be readily drawn out of the same by rotating the valve 9 a clear passage-way for water is always insured. Thus the circulation is constant and steady when the stem-valve 9 is open and the pipe A is kept clear without affecting the ordinary operation of the feed.

What I claim is 1. The combination, with a boiler, tank, and a feed-pipe connecting them as specified, of the automatic, main or boiler check-valve, a passage through the tubular seat and guide of said valve, a controllable stem-valve for closing or opening said passage, and the automatic, intermediate check-valve, having 'a lateral passage through its tubular valve seat WILLIAM I. MILLER.

l/Vitnessesz O. C. MILLER, J. R. LASKEY. 

